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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35587ff487e50ce6057626fccd8c9ea7d225a574dfa402c9487b46f46ec0a384' 
  AND token = '51MCkEZe2D1mfIXAfDO3QkhBrSQ1v6j1BS5X5L47eRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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