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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d18045e0e2093048b8535580f75e0c3effd6c9502525eb273b5cdf3d2ea15d' 
  AND token = '5ccXpLHBP7wLWPl1inDQvWl5qWdOGWBdxD6XUEt6XZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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