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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7674a594d89af08f159af75a5b201c4240a101b61a489ea9677f4f8da08fe811' 
  AND token = 'jy3MDEx2pdl4PUEXc0OWX5jGpn4QRIYLGgddJxzxoX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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