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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e8bfc37a51cc6accf4de3b93e53f55b0d752eb055b0da06c39a127f9eed013' 
  AND token = 'bmKtpzDBd7irhq2gnuyLF9l9fJGuhh8Z642hh5UbVCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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