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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ad6e9f3c2f1896b0b69e1ee5887454a525f3d43e751aaa61c13a4f72c491fc' 
  AND token = 'pRvgUqUeP54kgs51Tb+hbohTlVs2AxfSU9yMZz+w4k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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