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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c44a2f4b97b826a6020bfc215f11cccf346a33308e649a8db89ddf4f7cac8d0' 
  AND token = 'Teiafb1f+1EJUcZ2orZxJjlufY1pYvlC01J0wuIFYWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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