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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523fce6f926f63ec5435f423e6d426a51420d3a315cf65de8e7de26274064047' 
  AND token = 'UxGgswxcKa6fDBpMbLNnIMopH/c/SeXAyXAI+HUmp5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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