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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7ba94f4619bd5b1ca0750cb93eef425b9d79c961abc057e5c17d3741868367' 
  AND token = 'Yha4ns7uqUFAYMzt3Twd7cA84Gv0yDVLS9P3fiU0TPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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