SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2d20a6116c1631aa47787a29370652a6adbdcc8f49ad03a2de531275cccf4f' 
  AND token = 'yIwlvXrjTJnUJ7cRH+MCw/VGZqrsvBiAmBYaHFDyWxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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