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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6462c0b9a0398e2df4789bb7adb71e8bab765a0bc683ffe3b3b38fd6f318b515' 
  AND token = 'qomG40p5RLn15Ne9235X0K/5mXIu0uDJNCkD66qfFNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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