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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35002e4196a94403fdd8ec3837ed03a551c679067eafaab4a466810b62dc00f7' 
  AND token = '/kPgIp0D5HqIXn4VC+dqBycdnXcxnrAh5Sj2k9TPFu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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