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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5753d971921e6c60bc60f6195d7db3db929735c8d0694c343921444acae1e5c' 
  AND token = 'VLM0/8yzeb0Gek91/rv+vsdvnM+vu9NaE/cNWWYTOnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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