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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de243b912ec816b6a3ea8a68291a9eeea8a43987970ecef4710159fb1c087b7c' 
  AND token = 'yPFt89sT6+3AxD6LfdxtqE8vI7SinD8K8x+8Ugebw1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}