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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821f525191e925a4870e5c8a3471a6a20651bb35dd66daacccee7e535bc7c9d7' 
  AND token = '3TmPms7uk/vSKsRQjVCK2cCQTC+ln+NwUICEbZnkO2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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