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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf91ef19511a73a9c1fd892b1d2b396e326823aefe02308a20e4de44ba5be32f' 
  AND token = 'nw7GcldXhAjEH6dUG5jRkS8O+P5C3MBlOEN7W2wrHkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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