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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4dd42a8845fbc46189907db40a56bd425e1ed7b7cb4e83e33b4a4c6b222f5bd' 
  AND token = 'fr4kEOl6NzYZ3nqsxAkbIsdNnojogq+D/tkmc/4zIvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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