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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3b168dc78a81f50f9fd4ec0448b97b79d3af808c120f7f6f71f121c456dd3c' 
  AND token = 'gczuXrV/leJliC2/CodNam+AJWYQo9J668Vz5dhPooc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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