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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d461027cec35113f86546612d019392f068c90a8f2b6f19685ca4025afe116' 
  AND token = 'vpX4ay5dsY5OJljdFX1pD2qnk2prvHbcrs42ebxlpgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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