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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889aa32b84937423635c1ce201d01b11f01210b4741fcc88960b98b78f8444f7' 
  AND token = '1nNVzODwEzWtaUK8GMowyG3UzmPXd7C3JMmQLlk26bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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