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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e966c6f015ff9d8e04c63b4ae1d6eb17a140b60f86f0006322c471b34796541e' 
  AND token = 'h6+AlkE7WoGSdVfhW8XAJkHMU0lDAN66K3ytaj3n1sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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