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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac5ab182d6b5b4efc3acafdb37c7bbf7d7b1b7004cf9a4cbeb31480de7e76c5' 
  AND token = 'eCgkTaR2h+cG1cT9e8FkzWMzLbyTHjE3oBuSC8BqoZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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