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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05823944eeaaf78d567feef2e3db96a97fba715e3754adb9afa4a29aab029d07' 
  AND token = 'NeFiCogNwUg/EbM0qt2WMrvtGhkG7BuhBWPZTy7eYyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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