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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0d4324b6ad2c14d80d6bb3412c780c3fd5cb47b05a0c03d9f6e187ff7ee7b7' 
  AND token = 'qYWMOkmXaZId2xW8/EDaM+7tcZASfObscmmVH1WRaxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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