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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1463a6d7b2066b3cfc16701c2717cd28a9b49b60eec5452717fe1410bfe3874a' 
  AND token = 'Lv8KAfLeF6xadwC2tWoZ5XshRONmV9xZ8547W+/XaDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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