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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc1653f808270727ca4b0d5f412b61dbf2a47b0ec051ce948d495dc2b5d5de6' 
  AND token = 'YZrOFZWNdGwNFFaEeLQcw/yaZ85lnlpE0ZUpnnT6Nxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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