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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03973607e828d12019950074cbfc0d1a282eaa198ac587b03d50eb394277591c' 
  AND token = 's7Vay8ZTa1rc80D9DXhz6GLJOK52Ce/sLCDVrpoAjn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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