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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9a5a3b938aa420b7896d1e42f462fd6640839cef285b49e59e1129a7cfa4eb' 
  AND token = 'T9ZCRya4aM7miMxN7FENvxnhQEIPf69ODAIjSXfXs6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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