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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebfa8f6d0474cfec6eec7bf0ce866b0e92af52b3c6e969b53dfceb85927a787' 
  AND token = 'TDTW4EaMsbh6m1suvyhHD0KWSNSMGt8HTFb/iPxEhO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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