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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc312b521415e741b988f89c772a9916fdc9ee2d79b1661eb9f36a4fbb7ba46' 
  AND token = 'Z4cwjUYja6E+erZHzOI03gyA58AU3Wzo5Ie4deLJqhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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