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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8602042edd4ff41a474693ae2823e84de248f19860270dc87e4b455162c8199f' 
  AND token = 'QciU14PsXiKvAF+V44vAsn9pg6E0HW2vgtX9xxZA6rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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