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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbd058900e29ac73a562a2ed9072e3c0f7a9d8523d8dd3e95e88bb94864238b' 
  AND token = 'HVR26uRjhfeutwBM9ctppbjCEWAT6GdOfPkLkOzWlRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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