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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d5a920554bfb436d94341d7c9a942bcc8f2fe52f16a37b0aaf284c915f90c7' 
  AND token = 'I8kWeGQ6x81BB8D1MqBOo8pgTG8AOGqMTckA5wFtClU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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