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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0892c944f44720a8e358c92218a57dc8d1ae864f7160e56a922ae50e0f5595' 
  AND token = 'YHM8pGNHLX2LJpIUA2VxI+KJIkEsr5l0946chSRHk54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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