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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc44b5a2bf3184804f6212f9e969e129c477aa43f8395ae8d0daa161bb7603f' 
  AND token = 'a9dg92+WWaD100PUR3xABcRQK9Hdex4WbULkVhQR2hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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