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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9e8c33c36e6d6a24bb27c13579167f56d70cbb860af61545d6548cde2827f1' 
  AND token = 'naHXQKe2Hpt38irfEEiHmDdzj5H8TWCtN5o0X0NJadA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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