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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c10f83a7971a76f535952035271d9ff4f9be99c663d49c0ff54d7cb52051ad4' 
  AND token = '06a9c18qt8GwVhinGhY7nfSGcJbcou3ENJh778SCmYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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