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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2106547d71a5431b1c830f93cecb562adf9dacd82bf237c0476ea1f977e48f3' 
  AND token = 'h1GM4OrH7f4xhfz0TLpcNU3sv2P/4Q//xft4iTsIc2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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