SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af524b760145d99e76a788e994092a8a94c25c95803af9ed25ef47d47043d3a' 
  AND token = 'wwjRfPJTAZVJe/gAKngJotJ848o+ydYHRMUhqIallvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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