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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c042316e845fc4eb6f980b6cc321e1b465490371dd5a278aa7ec47754960af1' 
  AND token = 'f8gvGxNQ+0jpPcyo+BX7ETbpD6MBRw9aP6oFLTKEEOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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