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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd899409266febe0aaa03f7c7ebd1b30c7694d1d8f4fe3090001abc1134a7d182' 
  AND token = 'c9A53xUYVhf7tHuFc2hflhG8vH6iUg4NCTmBMVoY6c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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