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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792ed556fa6c90d7a6a4bea544dd099664fe63d24557e37634ccaa8800aeca1b' 
  AND token = 'YNZUmHK4D2tcqNB00y/F7bH64IfW76S4HBzQYqQPNcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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