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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a17e95563d7aa363e9b2490e6328eb0e0faec68f13052c0fb5012e720ca26f' 
  AND token = '3rigOe1Kw83yO8mDFOZv9/fgWpBxk90kcDAYzEyNnmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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