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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b4e5eb07a751ab2112db46dee03794b1bc0be6a5776422bd6bdb4ce104c85d' 
  AND token = 'H2c0JEqvL609XtjfoUeEA7BT6YhWY4oocmTUy07C6YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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