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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e9a8108a266758ff671b99d19b1e68f1bc2576ae48c3b7e0b5fcd1a162fb4f' 
  AND token = 'BXZdvGU86SJ0OFVUH6MkQD7vUgpXaNLrCAgh0fTdTH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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