SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66093dde511139fab4445b9acbfe19c6f625c3581280859fbc5f7f4f4ebb2faf' 
  AND token = 'dPzbmVvqIW7Cx+B3HGHBL+kxmlM/jOwB2HhlKfEtu1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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