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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a8eb4118848402447069b7d7315578090ecb02b41cf8226291d73b14b4c830' 
  AND token = '4hFrJbuOotOre1d2Q1orkiekInCp/zHy+xxD3HUiNQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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