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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80624c3bf090c6ddd5b611bbb6380b49d5025b7ed99b43d864763f7ba2acaae7' 
  AND token = 'kGXyw95rSDR68acjv/etPVUMqjqNmTeEiufTA3KCitE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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