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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0962b647f6ccddc489285f097f141d6d9df98988094f27d3a32db912caa18c23' 
  AND token = 'Rligc9WWoRTTUb1Oq7QPE9iOXqE1KFVn0yZPD0L3UBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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