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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697ce7371390314fe452a90113b26d5923b84881110cf0ae7766b75044c2077e' 
  AND token = 'GON0UioYWeJd1PI+f7MI6bE9Tlo+XXCvzRaU4MmORd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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