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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d600d92c926f09c3bc24b4da17836a398911dd0f02adcb3fdf5e7f1b563c444' 
  AND token = 'Ba2+TqCmU+JnkLp6MPiaNFLfampzuDQivrc9pip0GpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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