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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ff3b92e956c44e744ff54fa025ec3616415f2532f698ee089a510077db76fd' 
  AND token = 'ux1QjnowWV5Ib04RlK+VVLnL1uHfpSW8E7CRwvaH64I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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