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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81baf0cac4ac76fa22943a47775b4dc333ba136db302f0f9c7b530318714dcd1' 
  AND token = 'U6a5L3kIN5Qd02zKgABit9oRjnZE5izMD2nQePmJHn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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