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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c25abfb2fe5467b97b28caef0070a2a9fbc1a0108735d0286a31b192c8a8202' 
  AND token = 'NGvEKdxmj1dmmlb7k6jXy2TCCw69mlLC7mzFSUdJlkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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